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曲线上的桥梁布置,铁四院编的肆桥8003通用图和铁一院编的壹桥(71)8178通用图均采用偏角法。这两种通用图布置精度较高,但施工单位在长期的运用中,仍感到有下列不足之处: 1.偏角法是一个墩台不漏,依顺序连续布置测设位置。而实际测量时,在有深水的河流上修建墩台,为了维持流水的畅通,需要跳越分批修建墩台,因而有不适应施工测量的步骤。 2.偏角法只提供测量的一组数值。而施工单位为了避免差错,实行测量双检复核制,仅用一组数值,在同一途径上再测一次,那就减弱了双检复核制的意义。
Curves on the bridge layout, Iron IV courtyard of the Qiaqiao 8003 universal map and the iron hospital of the One Bridge (71) 8178 General drawings are used declination method. The layout accuracy of these two kinds of general plans is high, but the construction unit still feels the following deficiencies in the long-term use: 1. The declination method is a pier station without leakage, and the measuring and positioning positions are arranged continuously in sequence. In actual measurement, the pier is built on the river with deep water. In order to maintain the smooth flow of water, the piers need to be skipped in batches so that it is not suitable for the construction measurement. 2. Declination method provides only a set of measured values. The construction unit in order to avoid errors, the implementation of double-check measurement system, using only a set of values, in the same way retest once, then weakened the double check the significance of the system.